In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Example Input: Question: What's the average lifespan of the animal that has a jaw with properties similar to those that probably led to the evolution of baleen? Passage:The oldest true fossils of baleen are only 15 million years old because baleen rarely fossilizes, and scientists believe it originated considerably earlier than that. This is indicated by baleen-related skull modifications being found in fossils from considerably earlier, including a buttress of bone in the upper jaw beneath the eyes, and loose lower jaw bones at the chin. Baleen is believed to have evolved around 30 million years ago, possibly from a hard, gummy upper jaw, like the one a Dall's porpoise has; it closely resembles baleen at the microscopic level. The initial evolution and radiation of baleen plates is believed to have occurred during Early Oligocene when Antarctica broke off from Gondwana and the Antarctic Circumpolar Current was formed, increasing productivity of ocean environments. This occurred because the current kept warm ocean waters away from the area that is now Antarctica, producing steep gradients in temperature, salinity, light, and nutrients, where the warm water meets the cold.
 Links: a. Antarctic Circumpolar Current b. Dall's porpoise c. Salinity d. Salinity
Example Output: b

Example Input: Question: Were the two anarchists that Oerter met in New York born outside of United States? Passage:By the early 1890s he had moved away from Bavaria and, with his brother, was working in Duisburg. Together the brothers smuggled subversive anarchist literature into Germany from the Netherlands. Coming under increasing police pressure, and taking his queue from a number of other anarchist comrades in a similar predicament, early in 1892 he fled to the United States of America. On his arrival at New York he met up with the circle around Emma Goldman, Alexander Berkman, and politically like-minded comrades from Germany. Sepp Orter discovered in himself a talent for activism, turning out to have a flair for public speaking. During 1892 he was also the editor of the New York version of , published by the "Radical Workers' Association" ("Radikaler Arbeiter Bund") and the "Autonomy" group which also numbered among its members Josef Peukert. The stay in America was cut short, however. The authorities suspected that Oerter had somehow been involved in Alexander Berkman's attempt to assassinate a wealthy businessman called Henry Clay Frick. Those suspicions appear not to have been entirely unfounded. With financial assistance from Emma Goldman, Sepp Oerter returned to Germany. He travelled via London where he arrived in October, and where the editorial group publishing "Autonomy" gave him a mission to take printed material across Belgium to the German frontier in order to effect a clandestine introduction of the anarchist propaganda to Germany. Sepp Oerter was able to complete his mission with the help of his brother Fritz who had stayed behind when Sepp had escaped to America.
 Links: a. New York City b. Duisburg c. Emma Goldman d. New York City
Example Output: c

Example Input: Question: Was the population of Canberra greater than that of Adelaide the year Burbidge was appointed assistant agronomist at Waite Agricultural Research Institute? Passage:In 1943 she was appointed assistant agronomist at the Waite Agricultural Research Institute in Adelaide, where she started working on native pasture species for arid and semi-arid South Australia. She was appointed to the new position of systematic botanist at the CSIRO Division of Plant Industry, Canberra in 1946. At CSIRO she worked on organising and extending the herbarium, first as a research scientist and then as curator and was responsible for laying the foundations of the Herbarium Australiense, later the National Australian Herbarium. She wrote Key to the South Australian species of Eucalyptus L'Hér. but had not specialised on the genus. Her professional interest in systemic botany was reflected by her tenure as secretary of the systematic botany committee of the Australian and New Zealand Association for the Advancement of Science from 1948 to 1952. She also edited Australasian Herbarium News until her until 1953, when she took a years leave to be the Australian Botanical Liaison Officer at the Kew Gardens herbarium. While at Kew she photographed and indexed type specimens of Australian plants and made microfilm copies of Robert Brown's notebooks for Australian herbaria.
 Links: a. Royal Botanic Gardens, Kew b. Eucalyptus c. Canberra d. CSIRO
Example Output:
c

